206 



THE SCOLYTID BEETLES. 



^ chambers at base; (c) regular, short or long, with lateral entrance chambers at base; 

 (d) the most highly specialized short or long type, without lateral entrance chambers at 

 base. 



The foregoing classification and terminology is based on the observed 

 galleries of a large number of species representing 57 genera and 

 includes the galleries of European species figured by other writers. 



RELATION OF TYPES OF GALLERIES TO THE SUBFAMILIES AND 



FAMILIES. 



The relation of the eight groups of galleries to the subfamilies is 

 shown in the following table. In some cases one genus may be repre- 

 sented by several groups. In PityophtJiorus 26 species are represented 

 in groups 1, 4, and 5, and in Ips 39 species are represented in groups 

 2, 4, and 5. 



Table VI. — Relation of groups of galleries to the subfamilies in th£ Scolytoidea. 



Subfamilies. 



Groups of gallery types and number of genera In each group. 



1 



2 



3 



4 



5 



6 



7 



S 



Ipidse: 



Division I— 

 Cryphallnae. . 



Genera. 

 4 

 1 



Genera. 

 4 

 1 



Genera. 

 3 



Genera. 



Genera. 



Genera. 



Genera. 



Genera. 



Ipinee 



3 



3 



2 







Corthvllnae 



5 







Micraclnse 









1 





2 





Division II — 

 Crypturelnge. 

 Phlceotrlblnte 



2 









1 







2 



1 



2 



8 





2 





2 



2 





2 



7 



Scolytldse: 



Hexacolinse. 







1 

















1 

 1 





Scolvtinae 













1 



1 



Scolytoplatypodidse: 

 Scolytoplatypod- 

 insB 







1 

 2 









Platypodldse: 



Platypodlnse 

































This table shows that all of the simple types (1 and 2) are in the 

 Ipidse and that most of them fall in the first part of Division I, while 

 the more specialized types fall in the last part of Divisions I and II, 

 with the far greater number in the latter; also, that in Scolytidse 

 specialized types only have been found. It is probable, however, 

 that simple types will be found in the Scolytidse when we know more 

 about the habits of the species of the other genera of this family. 

 It is also interesting to note from Table VI the number of subfamilies 

 and genera in which the same group types are paralleled. 



